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Stock Based Compensation Expense (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock-based Payment Award
Stock-based compensation expense		$ 82.7	$ 84.6	$ 84.5
Tax benefit		20.0	20.4	30.4
Stock-settled awards
Stock-based Payment Award
Stock-based compensation expense		33.5	24.7	20.5
Cash-settled awards
Stock-based Payment Award
Stock-based compensation expense		0.8	0.6	1.0
Performance-based awards
Stock-based Payment Award
Stock-based compensation expense		46.7	57.5	61.5
Employee stock purchase plan
Stock-based Payment Award
Stock-based compensation expense		1.1	0.9	1.0
Other
Stock-based Payment Award
Stock-based compensation expense	[1]	$ 0.6	$ 0.9	$ 0.5
[1] Represents charges recorded for severance expense related to stock-based compensation awards.

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

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-Name Accounting Standards Codification
-Topic 718
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

+ References

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No definition available.

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